Rotary engine.



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ROTARY ENGINE. APPLICATION I'ILED JUNE 4, 1909.

J. .NIELSEN.

ROTARYl ENGINE. APPLIoATIoN FILED JUNI: 4, who.'

v Patented Jan.25, 1910.

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Snom/L tot @UW-meow J. NIELSBN. ROTARY BNGINB. APPLICATION FI'LIED JUNE 4, 1909. x

Patented Jan, 25,1910.

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JENs NIELSEN, or emma FALLS, Iowa.

' noTAnY ENGINE.

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Specification of Letters Patent.

Patented J an. 2 5, 1910.

Application led June 4, 1909. Serial No. 500,213.

To all whom 'it may concern:

Be it known that I, JENs NIELSEN, citizen of the United States, residing at Cedar Falls, in the county of Blackhawk and State of Iowa, have invented certain new and useful Im rovements in Rota which t e following is a specification.

rIhe present invention relates to mechanism having rotary piston members, which may be driven by steam, air, water, or other fluid, or may be operated as a pump to eliect the elevation or movement and the like.

The primary object of the present invention is to provide a structure that is novel, simple, inexpensive to manufacture, is very durable, and is entirely practicable for the purposes set forth.

In the accompanying drawings z-Figurc 'l is a longitudinal sectional view through one embodiment of the invention, showing two of the devices coupled together so as to form a double pump or in which one member may be employed as an engine or motor, and the other as a pump. Flg. 2 is a sectional view on the line 2-2 of Fig. 1. Fig. 3 is a detail view of the inner piston member or pinion. Fig. 4 is an end elevation of the structure. Fig. 5 is a view taken on the line 5-5 of Fig. 1. Fig. 6 is a corresponding view of a slightly modified form of structure.

Similar reference numerals designate corresponding parts in all the figures of the rawmgs.

In the embodiment disclosed in Figs. 1-6 inclusive, a suitable base 7 is employed, on which are mounted spaced casings 8, each casing consisting of a body 9 secured to the base and having a curved side wall 10 with an end wall 11, which may be integral therewith. though the integral structure is not necessary. An inner end wall 12 is also provided, which is suitably secured to the wall 10 b bolts 13 or other suitable fasteners, and has a circular rib or Shoulder 14 that fits within the body and properly positions of fluids, liquids Engines, of

said end wall vided with a channel 15 to receive a pac 'ng gasket 16. The casing 8, thus produced, is provided 'with inlet and outlet ports 17 which may open through the end wall 11, as shown in Figs. 4 and 5, or one may open through one side, as shown at 17, and the other through the bottom, as shown at 17" in Fig. The particular relation or places of pening of these ports is immaterial. Their inner end portions 18 are, however, enlarged, and are preferably formed inthe end wall 11, and said end portions are spaced apart. A crescent partition 19 is carried by the end wall 11, and is preferably, though not necessarily, integral therewith. This partition extends from one end of one of the ports to the end of the other, as will be obvious by reference to Figs. 5 and 6, said partition producing two circular channels 2() and 21 that are eccentrically disposed with respect to eachother but merge, as will be obvious.

In the form disclosed in Fig. l, where two casings as above constructed are employed, a shaft 22 extends from one casing to the other and passes through suitable stung boxes 23 in the inner end walls 12, and terminates within said casings. Fixed to the ends within the casing are outer piston members, each consisting of a head 24 having oliset internal gear teeth 25 that operate in the outer channel 20, as will be obvious by lreiference to Fig. 2.

The outer end wall 11 of each casing 8 has an outwardly tapered opening 26 disposed concentrically to the inner channel 21, and a journal gudgeon 27 that projects centrally with respect to said channel, has an out` Wardly tapered portion 28 that is snugly fitted in the tapered opening 26, and is main tained therein by a nut 29 or other suitable device threaded on the projecting end of said gudgeon, and bearing against the outer face of the wall 11. Journaled on the projecting portion of this gudgeon is an inner piston member 30,. which is provided with radial teeth 31 that intermesh with the teeth 12.. The end wall also is ro- 25, as shown in Fig. 2. As indicated. in Fig. 3. the teeth 31 are of the saine width throughout. their length with the exceptlonpf their roots. ln other words, their opposite faces that roperate with the opposing faces'of the teeth 25 arc disposed in parallel relation.

ln order to lulu-irate the bearings, oil cups 32 are provided with stems 33 that lead to tht` journal bearings foi-:the shaft 22 and each 2 aidgeon 27 is preferably provlded with a ltrngitudi-nal channel 34 having lateral ports 35 that lead to the bearings of the pinion 30.

It will, also be observed by reference to Fig. 1 that'in the structure shown, the head 24 has a portion spaced from the end wall 12. forming a chamber 36, and a drain pipe 37 leads from the lower end of this chamber, said pipe having a valve 38 therein. The chamber. however, is not an essential feature, though it reduces friction between the parts, but the drain pipe and valve are useful in order that water may be quickly removed from the space when the motor or pump is at a standstill. It is peculiarly advantageous in cold weather as the water if retained would freeze and perhaps break the pump. y

There are many important advantages inherent in and developed by the structure disclosed and claimed. In the first place, it will be obvious that the mechanism is exceedingly' simple. and can be cheaply manufactured. Experience has proven that it is very dura ble, and capable of highly eliicient work. As already explained, the apparatus can be used either as a motor or as a pump Without any change, and in the form shown in Fig. 1, both members connected with the shaft may be employed for one or the other, or one member may be utilized as a motor, and the other as a. pump. It will of course be understood that one member may be employed without the other, and used either as a motor or as a'pump, in which case, the projecting shaft 22 will have its free end supported in a suitable standard and bearing. For the purpose of transmitting power and motion to or from the engine, a pulley, gear, or other suitable means may be mounted on the shaft.

With this structure, it will be evident that because of the arrangement of the channels and the particular relation of the intermeshing teeth, a continuous and constant abutment is produced, between the inlet and outlet ports. These ports should be as near as possible to such constant abutment, and be enlarged inwardly,` as disclosed, in order to allow a. free passage of the material to and from the spaces between the teeth.

The particular mounting for the inner piston member is desirable, inasmuch as it is sin le, and is supported solely by one of the wa s.

Another distinct limprovement i1; this structure, is the particular construction and shape of the teeth of the inner piston member. As already explained, these teeth are rectangular with straight sides and of even thickness from root to apex, except that they may be tiared out. alittle from the roots at the two contact sides. This permits the best inter-action between the teeth, while substantially filling the openings between the internal teeth of the outer'member.

It will be obvious that the apparatus can be made in different sizes and preferably in the larger form of construction, the teeth 25 are cored out for the sake of lightness.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that varlous changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In apparatus of the character set forth, the combination with a base, of spaced casings mounted thereon, a shaft having its ends located in the casings, internal gears located respectively in the different casings and xed to both ends of the shaft, rotary pinions journaled in the casings eccentrically to the shaft and meshing with the internal gears, and crescent partitions interposed between the spaced portions of the meshing gears and arranged within the casings.

2. In apparatus of the character set forth, the combination with a casing having a substantially circular piston chamber, and supply and exhaust ports communicating therewith and having enlar ed inner end portions in one ofthe end wal s, said portions bein spaced apart, of a crescent partition locate within the casing and extending from the end of one port to the end of the other, forming two eccentrically disposed merging eircular channels, a. rotary piston member operating in the outer channel and having internal -gear teeth, and a rotary pinion piston member journaled in the other channel and having outstanding teeth meshing with the teeth of the first mentioned member.

3. In apparatus of the character set forth, the combination with a casing, of a rotatable outer piston member operating therein and having internal gear teeth, and a rotatable inner piston member operatin in the casing within the outer member an having its axis `,of rotation disposed eccentrically thereto, said inner piston member having radial teeth that intermesh with the teeth of the outer piston, and each of said teeth having opposite parallel side faces that co- Aoperate with the lnner opposing faces of the teeth of the outer member.

4:. In apparatus of the character set forth,

5 the comblnation with a casinhavn spaced 10 of the end Walls of the casing, and a valved drain port communicating with the ortion betweenthe head and end Wall an opening through the casing.

In testimony whereof I affix my Vsignature in presence of tWo witnesses.

J ENS NIELSEN. 

